/*
 * [New BSD License]
 * Copyright (c) 2011-2012, Brackit Project Team <info@brackit.org>  
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in the
 *       documentation and/or other materials provided with the distribution.
 *     * Neither the name of the Brackit Project Team nor the
 *       names of its contributors may be used to endorse or promote products
 *       derived from this software without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
package org.brackit.xquery.util.aggregator;

/**
 * @author Sebastian Baechle
 * 
 */
public enum Aggregate {
	SEQUENCE {
		@Override
		public Aggregator aggregator() {
			return new SequenceAggregator();
		}
	},
	COUNT {
		@Override
		public Aggregator aggregator() {
			return new CountAggregator();
		}
	},
	SUM {
		@Override
		public Aggregator aggregator() {
			return new SumAvgAggregator(false, null);
		}
	},
	AVG {
		@Override
		public Aggregator aggregator() {
			return new SumAvgAggregator(true, null);
		}
	},
	MIN {
		@Override
		public Aggregator aggregator() {
			return new MinMaxAggregator(true);
		}
	},
	MAX {
		@Override
		public Aggregator aggregator() {
			return new MinMaxAggregator(false);
		}
	},
	SINGLE {
		@Override
		public Aggregator aggregator() {
			return new SingleAggregator();
		}
	};

	public abstract Aggregator aggregator();
}
